Class Mammalia Linnaeus, 1758 - mammals
Order Rodentia Bowdich, 1821 - rodents
Suborder Hystricognathi Tullberg, 1899
see Infraorder Hystricognathi Tullberg, 1899
Family Echimyidae Gray, 1825 - spiny rats
Subfamily Eumysopinae Rusconi, 1935
see Subfamily Heteropsomyinae Anthony, 1917
Genus Proechimys Allen, 1899 - spiny rats
Subgenus Trinomys Thomas, 1921
see Genus Trinomys Thomas, 1921